Quality
HPLC and LC–MS for peptide identity and quality control
What HPLC measures, what LC–MS adds and why the two techniques provide complementary evidence for laboratory evaluation of peptides.
High-performance liquid chromatography separates components under defined conditions. The chromatogram presents retention times and detector responses. The relative area of a…
02What LC–MS addsLC–MS combines separation with mass-to-charge measurement. It can therefore associate a signal with expected ions and provide stronger evidence of identity.…
03HPLC vs LC–MS: what is the difference?HPLC primarily shows how components separate and are detected within a defined method, while LC–MS adds mass-to-charge information for ions associated…
04Complementary use in quality controlA documented analytical strategy starts with the attribute that must be measured. HPLC and LC–MS can provide orthogonal evidence for peptide…
What HPLC shows
High-performance liquid chromatography separates components under defined conditions. The chromatogram presents retention times and detector responses. The relative area of a peak depends on the method, wavelength, sample preparation and integration rules.
What LC–MS adds
LC–MS combines separation with mass-to-charge measurement. It can therefore associate a signal with expected ions and provide stronger evidence of identity. Ionisation response differs between substances, however, so signal intensity is not automatically equivalent to content.
HPLC vs LC–MS: what is the difference?
HPLC primarily shows how components separate and are detected within a defined method, while LC–MS adds mass-to-charge information for ions associated with chromatographic peaks. Neither technique alone answers every question about identity, purity or content.
Complementary use in quality control
A documented analytical strategy starts with the attribute that must be measured. HPLC and LC–MS can provide orthogonal evidence for peptide samples, but only when procedures are fit for purpose and supported by standards, controls, system suitability and predefined acceptance criteria.
LABORATORY APPLICATION
Turning the principle into an auditable record
A clear data package includes method description, system-suitability criteria, chromatogram, integration rules, mass spectrum and linkage to the sample identifier. HPLC should not be used alone as proof of mass, and LC–MS signal should not be converted into content without appropriate calibration.
PRIMARY & OFFICIAL SOURCES
Sources and further reading
COMMON QUESTIONS
Questions specific to this topic
Does HPLC prove identity?
Retention time can support identity against a standard, but stronger evidence usually requires an orthogonal method.
Is LC–MS inherently quantitative?
No. Quantitation requires suitable calibration, standards and confirmed performance in the relevant matrix.
What is the difference between HPLC and LC–MS?
HPLC characterises separation and detector response under defined conditions. LC–MS adds mass-to-charge information for detected ions.
How do they support peptide quality control?
They can provide complementary separation and identity evidence when the procedures are suitable, documented and controlled with standards and controls.